diff --git a/addons/mail/__manifest__.py b/addons/mail/__manifest__.py
index da46e75ef1d..bf0987a60bc 100644
--- a/addons/mail/__manifest__.py
+++ b/addons/mail/__manifest__.py
@@ -102,6 +102,7 @@
             'web/static/src/legacy/js/services/data_manager.js',
             'web/static/src/legacy/js/services/session.js',
             'web/static/src/legacy/js/widgets/date_picker.js',
+            'web/static/src/legacy/legacy_promise_error_handler.js',
             'web/static/src/legacy/legacy_rpc_error_handler.js',
             'web/static/src/legacy/utils.js',
             'web/static/src/legacy/xml/base.xml',